9 min read
White Powder on Plant Leaves: Powdery Mildew on Houseplants
A flat, flour-like white coating that spreads across leaf surfaces is usually powdery mildew. Learn how to tell it from mealybugs, hard water residue and dust, then fix it with better light and airflow and, if needed, a houseplant-labeled spray.
2026-10-19plant-problems